Kaz hits lefties better, but won't run on them. Which makes him painful to play against either.
Frank Thomas has historically hit lefties better. But not so much this year.

Any way, I can see how knowing the splits can help you decide who to start or bench. But, how will it help you with a roster? Unless you've got a Broussard/Merloni platoon from the same team on your roster, what're the odds that your back up 1B who's a leftie killer is facing a leftie the same night as your starter?